also amassing supporters of president mohamed morsi and a controversial vote this weekend on a new constitution. today as you might imagine, tensions are very high as the political crisis threatens to ignite new conflicts. reza, what is happening now? >> reporter: ted, i don't think too many people want a repeat performance what have we saw last week, at the presidential palace where the two sides of the conflict met here and came to blows, nearly 700 people injured in clashes, several people killed. today the stage is set for another potentially violent and explosive day, because both these sides again have called for mass demonstrations within the next hour, opposition factions, critics of the president, have set out on marches that are going to culminate here at the presidential palace. in about 15, 20 minutes away from this location, that's where the muslim brotherhood, the supporters of the president, have called for their own demonstrations. i think a lot of people are relieved that these demonstrations aren't going to be at the same location but the potential for protesters to cross path